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Commentary by Pigini

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Insulator Failures from Improper Selection

At a past CIGRE meeting in Paris and in particular during the Study Committee B2 session on Overhead Lines, there was much discussion on the still debated issue of the ‘stateof- the-art’ of composite insulator technology. A spectrum of contradictory case... Read More

Dielectric Strength & Air Density

While a number of atmospheric parameters affect the dielectric strength of external insulation, relative air density (δ) and absolute humidity are considered the most significant. Here, the focus is on the former, which plays a key role in developing... Read More

External Insulation Under Composite AC Plus DC Voltages

Growing interest in parallel routing of AC and DC circuits on the same towers of what are referred to as ‘hybrid overhead lines’ could cause both AC and DC voltage components (known as composite voltages) to appear on line insulators. Up to now, knowledge... Read More

Digital Modeling in Insulation System Design

Given the evolution in computing power and specialized software, finite element analysis (FEA) has evolved from what used to be a mainly academic pursuit into a much-used tool for product development. Engineering simulation technology, for example, now allows... Read More

Designing for Reliability Versus Resilience

Projections on climate change confirm that power systems will be exposed to increasing threats of the type that jeopardize continuity and quality of supply. An example was the complete collapse of the transmission grid in Puerto Rico after a powerful... Read More

Revising IEC 60815

Specifications contained in IEC 60815 “Selection and dimensioning of high-voltage insulators intended for use in polluted conditions” are the result of work going back to 2000 when international experts in WG11 first started to set up the documents. With... Read More

‘Externalities’ of Overhead Power Lines

Public opposition and growing environmental awareness now make identifying corridors for new overhead lines an increasingly complex process – especially near densely populated or sensitive areas. Given this, it has become important to examine methodologies... Read More

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